Add the deleteAll function to the client

[smikey]

Is your feature request related to a problem? Please describe.
I have the problem that I have to delete a node with multiple (+1000) children sometimes.

Describe the solution you'd like
There should be a function to delete a node with its children.

Describe alternatives you've considered
I've written a recursive delete function to delete a node with many children. This solution is very slow compared to the rmr/deleteAll command in the zkCli.sh

[DavidVujic]

Thank you for suggesting this feature! I'll have a look, or even better, can you give it a try and send a pull request?

[DavidVujic]

I think this is a feature existing in the Java CLI (deleteRecursive) and server (multi). I think this is a bit more work than I had initially thought. @smikey Do you have any examples of the delete children function that I can have a look at?

https://github.com/apache/zookeeper/blob/master/zookeeper-server/src/main/java/org/apache/zookeeper/ZKUtil.java#L138

https://github.com/apache/zookeeper/blob/c74658d398cdc1d207aa296cb6e20de00faec03e/zookeeper-server/src/main/java/org/apache/zookeeper/cli/DeleteAllCommand.java

[DavidVujic]

This is a feature not existing in the official C client. An issue is registered here (but it seems that the team has moved it forward to upcoming releases a couple of times).

[DavidVujic]

An idea:

as an alternative to add a custom implementation in JavaScript (because it is not currently existing in the C client) could be to add an example implementation async deleteAll function - that is making calls to the existing ode. This could be stored in the examples folder and in the README and not that difficult to copy-paste as a helper in the apps using this library.

By doing this, it wouldn't be any breaking changes if the C client will have a deleteAll feature with (most likely) a different API, than if we could add it today.